ci: bump all upload-artifact users to v3

.github/workflows/binaries-linux-arm32v7-static.yml

@@ -46,7 +46,7 @@ jobs:
           docker rm -v $container_id
 
       - name: Upload binary
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: hledger-linux-static-arm32v7
           path: /tmp/hledger-linux-static-arm32v7

.github/workflows/binaries-linux-x64-static.yml

@@ -65,7 +65,7 @@ jobs:
         strip /tmp/hledger/hledger-web
 
     - name: Upload binaries
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: hledger-linux-x64
         path: /tmp/hledger

.github/workflows/binaries-windows-x64.yml

@@ -176,7 +176,7 @@ jobs:
              
     # XXX intermittent upload failures
     - name: Create executables artifact
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: hledger-windows-x64
         path: tmp/hledger-windows-x64